Insider trading

Period: 12 months Stock: MASS Type of trade: Sold × + Add filter Clear all
Views & alerts

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When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

55 decisions over 12 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

55 decisions over 12 months
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

55 decisions over 12 months Remove this filter
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

55 decisions over 12 months
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
55 decisions over 12 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
55 decisions over 12 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

55 decisions over 12 months
Stock
Insider
Type ?
Why it stands out
7 Oct 2026
Sold on a plan
$356.70K 30,000 at 11.89
3.9%
Planned (10b5-1)
6 Oct 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$65.15K 5,000 at 13.03
4.1%
Planned (10b5-1)
29 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$207.32K 18,000 at 11.52
0.4%
Not planned
24 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$272.63K 24,000 at 11.36
0.5%
Not planned
23 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$11.25K 1,000 at 11.25
0.0%
Not planned
17 Sep 2026
Kenneweg John SVP, Sales & Product Marketing
Sold on a plan
$53.73K 5,257 at 10.22
8.3%
Planned (10b5-1)
16 Sep 2026
Kenneweg John SVP, Sales & Product Marketing
Sold on a plan
$216.34K 21,399 at 10.11
27.0%
Planned (10b5-1)
15 Sep 2026
Kenneweg John SVP, Sales & Product Marketing
Sold on a plan
$10.00K 1,000 at 10.00
1.7%
Planned (10b5-1)
2 Sep 2026
Sold on a plan
$317.40K 30,000 at 10.58
3.7%
Planned (10b5-1)
25 Aug 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$125.48K 11,459 at 10.95
8.6%
Planned (10b5-1)
21 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$441.16K 41,578 at 10.61
0.9%
Not planned
20 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$88.64K 8,422 at 10.52
0.2%
Not planned
17 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan
$207.00K 20,000 at 10.35
3.5%
Planned (10b5-1)
13 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan
$76.68K 7,622 at 10.06
1.3%
Planned (10b5-1)
12 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan
$27.66K 2,747 at 10.07
0.5%
Planned (10b5-1)
11 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan 2×
$1.44M 145,918 at 9.90
19.9%
Planned (10b5-1)
11 Aug 2026
Sold on a plan
$77.14K 8,358 at 9.23
1.0%
Planned (10b5-1)
10 Aug 2026
Sold on a plan
$85.26K 9,442 at 9.03
1.1%
Planned (10b5-1)
10 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan
$3.15K 348 at 9.06
0.0%
Planned (10b5-1)
5 Aug 2026
Sold on a plan
$169.80K 20,000 at 8.49
2.4%
Planned (10b5-1)
4 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$417.77K 50,000 at 8.36
1.0%
Not planned
2 Jul 2026
Sold on a plan
$19.84K 2,200 at 9.02
0.3%
Planned (10b5-1)
2 Jul 2026
Knopp Kevin J. President and CEO
Sold on a plan
$2.01K 222 at 9.07
0.0%
Planned (10b5-1)
30 Jun 2026
Sold on a plan
$176.80K 20,000 at 8.84
2.3%
Planned (10b5-1)
26 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$25.43K 2,798 at 9.09
0.4%
Planned (10b5-1)
25 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$149.13K 16,388 at 9.10
2.2%
Planned (10b5-1)
24 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$370.49K 40,535 at 9.14
5.1%
Planned (10b5-1)
23 Jun 2026
Sold on a plan
$89.50K 9,900 at 9.04
1.1%
Planned (10b5-1)
23 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$31.00K 3,422 at 9.06
0.4%
Planned (10b5-1)
23 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$27.46K 3,050 at 9.00
0.1%
Not planned
22 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$41.97K 4,668 at 8.99
0.1%
Not planned
4 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$356.86K 39,782 at 8.97
0.8%
Not planned
4 Jun 2026
Sold on a plan
$900.00 100 at 9.00
0.0%
Planned (10b5-1)
3 Jun 2026
Sold on a plan
$174.60K 20,000 at 8.73
2.2%
Planned (10b5-1)
2 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$22.38K 2,500 at 8.95
0.1%
Not planned
28 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$1.48M 170,442 at 8.66
3.3%
Not planned
28 May 2026
Sold on a plan
$270.00K 30,000 at 9.00
3.2%
Planned (10b5-1)
28 May 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$62.67K 6,940 at 9.03
5.0%
Planned (10b5-1)
27 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will 2×
$136.17K 16,500 at 8.25
0.3%
Not planned
11 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$41.26K 5,000 at 8.25
0.1%
Not planned
8 May 2026
Kenneweg John SVP, Sales & Product Marketing
Sold at will
$148.05K 18,255 at 8.11
24.0%
Not planned
8 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$24.81K 3,025 at 8.20
0.1%
Not planned
7 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$105.17K 12,819 at 8.20
0.2%
Not planned
6 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will 2×
$502.16K 62,365 at 8.05
1.2%
Not planned
6 May 2026
Sold on a plan
$144.60K 20,000 at 7.23
2.1%
Planned (10b5-1)
1 May 2026
Kenneweg John SVP, Sales & Product Marketing
Sold at will
$53.19K 7,787 at 6.83
9.3%
Not planned
10 Apr 2026
Sold on a plan
$124.28K 17,578 at 7.07
1.8%
Planned (10b5-1)
10 Apr 2026
McCallion Kevin J. SVP, Products and Production
Sold on a plan
$18.88K 2,693 at 7.01
5.7%
Planned (10b5-1)
9 Apr 2026
Sold on a plan
$52.04K 7,392 at 7.04
0.8%
Planned (10b5-1)
9 Apr 2026
McCallion Kevin J. SVP, Products and Production
Sold on a plan
$38.10K 5,420 at 7.03
10.8%
Planned (10b5-1)
Showing 1–50 of 55. Page 1 of 2 Older →